厌氧发光杆菌纲：原核生物界(kingdom Procaryotae)薄壁菌部(division Gracilicutes)中的一纲，革兰氏阴性厌氧菌，由光摄取能量(向光代谢)，包括紫色无硫菌即红硫菌科(Rhodospirillaceae)、紫色硫菌即着色菌科(Chromatiaceae)和绿硫菌即绿菌科(Chlorobiaceae)- azygospore
- azygous
- azymia
- B
- b
- B.A.
- Ba
- Baastrup's disease(syndrome)
- Babbitt metal
- Babcock's operation
- Babcock's test
- Babesia
- babesiasis
- Babesiella
- Babesiidae
- babesiosis
- Babinski-Nageotte syndrome
- Babinski's law,etc
- Babinski-Vaquez syndrome
- baby
- Babès-Ernst granules(bodies)
- Babès' treatment,tubercles
- bacampicillin hydrochloride
- bacca
- baccate